20253806563 has 8 divisors (see below), whose sum is σ = 20612928960. Its totient is φ = 19895212200.

The previous prime is 20253806557. The next prime is 20253806581. The reversal of 20253806563 is 36560835202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20253806563 - 2⁹ = 20253806051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20253806663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54213 + ... + 208438.

It is an arithmetic number, because the mean of its divisors is an integer number (2576616120).

Almost surely, 2^20253806563 is an apocalyptic number.

20253806563 is a deficient number, since it is larger than the sum of its proper divisors (359122397).

20253806563 is a wasteful number, since it uses less digits than its factorization.

20253806563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264017.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 20253806563 in words is "twenty billion, two hundred fifty-three million, eight hundred six thousand, five hundred sixty-three".